var Button = Class.extend({
    top   : null,
    left  : null,
    width : null,
    height: null,
    text  : null,
    init: function(config)
          {
            this.top    = config.top    || 0;
            this.left   = config.left   || 0;
            this.width  = config.width  || 0;
            this.height = config.height || 0;
            this.text   = config.text   || 0;
          }
});